As neal said, there is no repair for that. Ripping it out and replacing will be your only option.
Yours dosn't look like anything standard, can you take a few more photos so we can get a better look at what you have. It looks more like something someone just made up as they went along.
Oh I thought it was the door jamb of a pre-hung interior door that had been shimmed and all that, with the hinges and lock set etc. If its just a strip of MDF then I agree just replace it.
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